using Microsoft.Extensions.Logging;
using WarcViewerBlazorWinForm.Library.EventBus;

namespace WarcViewerBlazorWinForm.Backend.Logging
{
    internal class LoggingIntoEventBus : ILoggerProvider
    {
        public IEventBus? EventBus { get; set; }

        public void Dispose()
        {
        }

        public ILogger CreateLogger(string categoryName)
        {
            return new LoggingIntoEventBusLogger(categoryName, this);
        }

        private class LoggingIntoEventBusLogger : ILogger
        {
            private readonly string _categoryName;
            private readonly LoggingIntoEventBus _owner;

            private const string CAT_TRIM_PREFIX1 = $"{nameof(WarcViewerBlazorWinForm)}.";

            public LoggingIntoEventBusLogger(string categoryName, LoggingIntoEventBus owner)
            {
                _categoryName = categoryName;
                if (_categoryName.StartsWith(CAT_TRIM_PREFIX1)) _categoryName = _categoryName[CAT_TRIM_PREFIX1.Length..];
                _owner = owner;
            }

            public IDisposable? BeginScope<TState>(TState state) where TState : notnull => default;

            public bool IsEnabled(LogLevel logLevel) => true;

            public void Log<TState>(LogLevel logLevel, EventId eventId, TState state, Exception? exception, Func<TState, Exception?, string> formatter)
            {
                if (_owner.EventBus == null) return;

                var content = Convert.ToString(state);

                if (exception != null)
                {
                    content = $"{content} {exception}";
                }

                var formatted = $"[{DateTime.Now:dd HH:mm:ss}] {_categoryName} {content}";
                _owner.EventBus.Publish(new LoggingEvent(logLevel, _categoryName, formatted));
            }
        }
    }
}